7z2n | pdb_00007z2n

Tubulin-18-complex

spinqualitylabelsall models 7z2n, resolution 2.17Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7z2n is a 6 chain structure with sequence from Bos taurus, Gallus gallus and Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACP, CA, GDP, GTP, IAZ, MES, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [E1BQ43_CHICK] Publication Abstract from PubMed Microtubules (MTs) are dynamic filaments of the cytoskeleton, which are formed by the polymerization of their building block tubulin. Perturbation of MT dynamics by MT-targeting agents (MTAs) leads to cell cycle arrest or cell death, a strategy that is pursued in chemotherapy. We recently performed a combined computational and crystallographic fragment screening approach and identified several tubulin-binding fragments. Here, we sought to capitalize on this study with the aim to demonstrate that low affinity tubulin-binding fragments can indeed be used as valuable starting points for the development of active, lead-like antitubulin small molecules. To this end, we report on a new, rationally designed series of 2-aminobenzimidazole derivatives that destabilize MTs by binding tubulin at the colchicine-binding site (CBS). We applied a fragment growing strategy by combining X-ray crystallography and computer-aided drug design. Preliminary structure-activity-relationship studies afforded compound 18 that inhibits HeLa cell viability with a submicromolar activity (IC50 of 0.9 muM). X-ray crystallography confirmed the compound pose in the CBS, while immunostaining experiments suggested a molecular mechanism of action alike classical CBS ligands with antimitotic and antitumor activity associated with MTs destabilization. This promising outcome underpins that our previously performed combined computational and crystallographic fragment screening approach provides promising starting points for developing new MTAs binding to the CBS of tubulin and, eventually, to further tubulin pockets. Novel fragment-derived colchicine-site binders as microtubule-destabilizing agents.,de la Roche NM, Muhlethaler T, Di Martino RMC, Ortega JA, Gioia D, Roy B, Prota AE, Steinmetz MO, Cavalli A Eur J Med Chem. 2022 Nov 5;241:114614. doi: 10.1016/j.ejmech.2022.114614. Epub, 2022 Jul 16. PMID:35939994 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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